The potential use of HNO 3 -treated clinoptilolite in the preparation of Pt/CeO 2 -Clinoptilolite nanostructured catalyst used in toluene abatement from waste gas stream at low temperature

Abstract

In this paper, CeO 2 (30%)/Clinoptilolite was synthesized via HNO 3 treatment and coprecipitation methods and then 1% Pt was dispersed over support by ultrasound assisted wet impregnation. The synthesized samples were characterized using XRF, XRD, FESEM, N 2 adsorption and FTIR techniques. The obtained results from XRD revealed the main phase in utilized clay is clinoptilolite and also formation of amorphous structure was proved after acid treatment. FESEM micrographs confirmed significant structural changes in clinoptilolite after acid treatment and also formation of ceria nanoparticles. N 2 adsorption presented large enough surface area for Pt/CeO 2 -Clinoptilolite nanostructured catalyst to be used for toluene oxidation. Finally, activity results indicated that synthesized nanostructured catalyst was highly active and stable and could eliminate more than 90% of toluene at 130°C. Utilizing inexpensive materials in synthesis and assisting ultrasound in dispersion of active phase have made Pt(1%)/CeO 2 (30%)-Clinoptilolite a nominee to be used for catalytic oxidation of toluene. ª 2015 The Authors. Production and hosting by Elsevier B.V. on behalf of King Saud University. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

Catalytic Ozonation of Toluene Using Chilean Natural Zeolite: The Key Role of Brønsted and Lewis Acid Sites

“…Such studies have focused on the removal of sulphur dioxide from combustion gases [16], the removal of VOCs (via adsorption) [17,18], the regeneration of toluene-saturated natural zeolites (via ozonation) [19], and the catalytic oxidation of toluene [20,21]. Among natural zeolites, clinoptilolite is the most common material used for toluene oxidation.…”

Acid-modified clinoptilolite as a support for palladium–copper complexes catalyzing carbon monoxide oxidation with air oxygen

“…The acid–thermal modification of clinoptilolite results in a substantial increase in both a Si:Al ratios and its surface acidity [1]. There are also changes in adsorption capacity towards metal ions [17, 18] and water vapor [12, 19], in thermochemical properties [10], in relative crystallinity [13], and in sizes of crystallites [8, 12], and also in structural-adsorption parameters such as a specific surface area (S sp ), sizes and volumes of pores [7–15]. …”

“…Mostly, for clinoptilolite modification, hydrochloric or sulfuric acid [7–14] and, more rarely, phosphoric [33] or nitric [3, 4, 15] acid are used. Our choice of nitric acid as a modifying agent is caused by the following circumstance.…”

Synthesis of modified catalyst and stabilization of CuO/NH4‐ZSM‐5 for conversion of methanol to gasoline

“…Zeolites and the zeolite‐based catalysts are considered as the suitable options for this process due to unique structure and properties. The zeolites are proper for thermal catalytic cracking process due to being stable, selectable form, non‐corrosive and environmentally‐friendly . The zeolites are the crystalline microporous alumina silicates with a pore with the size of 3‐7 (Å).…”

“…The zeolites are proper for thermal catalytic cracking process due to being stable, selectable form, noncorrosive and environmentally-friendly. [5][6][7][8][9] The zeolites are the crystalline microporous alumina silicates with a pore with the size of 3-7 ( A). The most important characteristics of these solid materials include clear structure, large specific surface, selective adsorption of small molecules (molecular sieves) and ion exchange.…”